Described is the Del Mod System, its inception, the fundings associated with it, and its objectives. A number of projects have already been completed and implemented. This monograph describes the evaluations of such projects and of the Del Mod systems-approach to science education. The area of evaluation and the method of data collection (with guidelines listed) are described. Problems of the System's evaluation are noted. These include lack of financial resources, inadequacy of some designs, and public apprehension about research. References are cited. (EB)